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Hyōga is one of the main characters in the series. Hyōga appears calm, collected, and unemotional. Beneath the surface, however, he is passionate and devoted to his ideals. As a Saint born under the Cygnus constellation, Hyōga is able to control and manipulate ice and snow as he pleases, as he mastered the basis of the technique of the Saints of ice, stopping the atoms of matter by the power of their Cosmo.

In the manga, Hyōga originally did not choose to participate in the Graude Foundation's Galaxian Wars until he received an order from Sanctuary to assassinate the other bronze saints. He originally accepted this due to his hatred for the Graude Foundation, being aware that Mitsumasa Kido was his father. As he became more familiar with his subjects, however, Hyōga grew indecisive about his mission. Once Silver saints began to target him along with the other bronze saints, however, he dropped his allegiance to Sanctuary. His rage towards Sanctuary boiled after his master Camus made an unexpected visit to Siberia to sent his mother's ship deep into the ocean's abyss.

When the series began, Hyōga was depictaed as cold and calculating, and he was often seen keeping distance from the other saints. During the battle with Phoenix Ikki, his tender side was revealed, and he slowly began to display his true personality. In the Sanctuary arc, Hyōga became extremely close to Andromeda Shun after his comrade displayed an act of selflessness in an attempt to revive his cosmos from death, constantly referring to how he owed Shun his life.

Since the saints are only Mitsumasa Kido's protegés in the anime, this sub-plot isn't there; Hyōga competes with the same motivation as the other bronze saints—to win the Gold Cloth of Sagittarius, although during the Sanctuary arc Camus does sink Hyōga's mother's ship as he did in the manga.

(20th century): Appears for the first time near the Sanctuary, in aid of Eagle Marin, which is to protect Pegasus Seiya from the attack of the Angel Touma (a warrior sent from Olympus that has the task to kill Seiya). Clashes briefly with the Angel and sent him away by freezing the arm with his technique Diamon Dust . Marin tells Seiya, Hyōga that are 3 days old, Hyōga is shocked and is very concerned about the arrival of the Angels to the Sanctuary, Shaina comes and says to take care of Seiya with Marin. Then come on the sacred Mount Olympus, clashes again briefly against Touma, blocking it with his technique called Koliso. Then, with his friend Saint (Dragon Shiryu), are accompanied by the witch Hecate, in passage the space-time of Chronos, by means of which they reach the 18th century.

Hyoga is proclaimed as a future Gold Saint of Aquarius successor of as Aquarius Mystoria and Aquarius Camus.

By increasing his Cosmo, Hyōga can freeze objects and people. In his fight against his master, Gold SaintAquarius Camus, Hyōga awoke the 7th sense and used absolute zero air, allowing him to freeze even the Gold Clothes, surpassing his teacher. In the Hades Arc, Hyōga was able to use a variation of the Freezing Coffin of his teacher but it was not named.

Hyoga's Diamond Dust.

Diamond Dust (ダイヤモンドダスト, Daiyamondo Dasuto): Basic technique of freezing, it is the basis of Hyōga's blows. Hyōga uses a punch which unleashes a barrage of ice crystals at his enemy, freezing and / or paralyzing them. With the evolution of Hyōga's cosmos, the force of the blow was enough to defeat various enemies. It is generally the technique that Hyōga uses first, to test the strength of his opponent. The blow may suffer variations, as used to reflect the psychic blow of Phoenix Ikki.

Before learning Aurora Execution, his most powerful technique is Holodnyj Smerč (ホーロドニースメルチ, Hōrodonī Sumeruchi, Cyrillic: холодный смерч, meaning "ice tornado"). It is a technique that captures his Cosmos into a single tornado, which is unleashed via an uppercut.
The Aurora Thunder Attack (オーロラサンダーアタック Õrora Thunda Attack) is a horizontal variation of the Kholodinyi Smerch. The "Aurora Thunder Attack" is performed by clasping both of his hands together as he expels snow and ice at the opponent.

Hyōga learns Aurora Execution (オーロラエクスキューション, Õrora Ekusukyūshon) directly from battling his master, Gold SaintAquarius Camus. "Aurora Execution" is a Gold Saint level technique that enables the user to have control over Absolute Zero, a point where everything becomes frozen. "Aurora Execution" is similar to "Aurora Thunder Attack" in execution.

A minor technique Hyouga possesses is Kol'co (カリツォー, Karitsō, Cyrillic:КОЛЬЦО, meaning "ring" in Russian), with which he creates an ice ring that surrounds and paralyzes the opponent.

The one person that forever lives in Hyōga's mind is his deceased mother. She died when Hyōga was still very young, having drowned during the shipwreck of a doomed cruise. The ship sunk into the icy ocean, where the extreme cold kept Hyōga's mother from decaying. Throughout the Sanctuary arc, Hyōga is shown to visit his mother periodically by diving into the waters. Later on, the ship is sent deep into the ocean's graves as part of a final lesson from Hyōga's master, Camus of the Aquarius constellation.

Hyōga and his mother are both Christians, and put their faith in a deity different from the show's established Greek gods,

A young child from the village where he and Hyōga lived, more precisely the chieftain's grandson. He appears both in the manga and the anime. He is an ordinary child, and hangs out with Hyōga whenever he returns to Siberia and keeps an eye on Natasha's ice tomb for him. In the anime, he was the one to relay news of the Crystal Saint's sudden change of personality to Hyōga and Seiya, since he was the only one able to escape from his grip.

In the anime adaptation, Hyōga's master was the Crystal Saint, with Aquarius Camus being his master's sensei (thus, making the gold saint the equivalent of an idol in Hyōga's eyes). The Crystal Saint was a very gentle man with an extremely strong sense of justice, and his abilities hovered around silver saint level; Hyōga himself saw him as a surrogate father, more than a master.

The Crystal Saint was first introduced in the Sanctuary arc, where he openly opposed the Pope Ares's actions against Saori Kido and her bronze saints and actually went to the Sanctuary to face the Pope and ask him what was going on. But before the Crystal Saint could speak out further, the Pope used his Emperor Demon Fist—a technique that forced the victim to obey him against his will, practically brainwashing him. Unbeknownst to the Pope, Seiya's master Eagle Marin was a witness of this.

The Crystal Saint was then sent to assassinate Hyōga, using little Yakoff and the people of the village where he used to live as hostages. Seiya was warned of this by Marin and managed to reach Siberia in time to free Yakoff and the townspeople and tell Hyōga. A battle ensued between teacher and student anyway, with Hyōga reluctantly landing the final blow. The strike knocked the Crystal Saint out of Ares's grasp, but proved fatal as well; after mourning him, with Yakoff and Seiya's help Hyōga buried him in the Siberian ice.

In the manga, Hyōga was trained directly by Camus, the Gold Saint of Aquarius. In contrast with the sweet-tempered yet still strict Crystal Saint, Camus had a more stoic and cold personality, and his methods sometimes unorthodox. In one instance, in order to force Hyōga to abandon his emotional ties with his mother and become closer to mastering absolute zero, Camus created whirlpools and typhoons in the ocean where Hyōga's mother lie. To Hyōga's dismay, the storm caused the ship to sink deep into a part of the ocean out of Hyōga's reach.

Hyōga and Camus later met face to face in the Temple of Libra after the gold saint intervened in the Gemini Saint's "Another Dimension" attack. Here, Camus confirmed Hyōga's suspicious that he was responsible for sinking the ship. Enraged, Hyōga attacked his master, but was defeated after Camus revealed that Hyōga's emotional ties to his mother are still unsevered. Camus then encased Hyōga in a block of ice with his "Freezing Coffin" technique, hoping that Hyōga would sleep until he actually understood his mission and was able to break the coffin himself.

With the aid of the other bronze saints, the Cygnus became free and once again challenged Camus when they reached the Temple of Aquarius. After an epic battle, Hyōga's cosmos finally reached its summit and he challenged Camus with his own patented technique—the "Aurora Execution." Both sides unleash the ice move at each another, and Camus falls—but not before displaying satisfaction that Hyōga had mastered absolute zero.

A side story from the manga. While in Siberia, Hyōga was invited to meet a group of warriors known as "The Blue Warriors." According to Camus, they were a formidable group with abilities rivaling the Saints. Alexei, the leader of this tribe, insisted that Hyōga help them in a plot to invade other parts of the world—or face death. Hyōga, of course, refused on account of being one of Athena's saints, and a battle began. Unfortunately, Hyōga was doomed to lose, as he had not donned his Cygnus Cloth—Alexei's "Blue Impulse" attack proved to be too much, and Hyōga was defeated. The Blue Glide then imprisoned the Cygnus Saint, with hopes that he would later reconsider.

Inside the dungeon of the Blue Warriors' castle, Hyōga awoke to meet a young woman caring for him. She introduced herself as Natassia, a name that caught Hyōga by surprise. Natassia then begged Hyōga to stop Alexei from assassinating her father. As it turns out, her father was a man of peace, and abhorred using violence to solve problems. Alexei believed in the exact opposite, and vowed to kill his own father in other to further his own ambitions. Natassia, visibly shaken, threatened to commit suicide if her father's blood is spilled.

Sadly, she could not stop Alexei in time—the deed had been done as he sliced his own father in half. With the Cygnus Cloth at his disposal (sneaked inside by Yakoff), Hyōga proceeded to escape his prison and locate Alexei. It wasn't long before the two discovered each other, and a second battle ensued. This time, the Blue Glide leader was easily defeated, and he regained his senses. Right then, Yakoff rushed towards them with news of Natassia—she had followed through with her promise, and was now sitting outside in the freezing ice storm, silently praying. A chunky layer of ice had formed on her body, and her body temperature lowered by the second. Hyōga quickly freed her with a punch, and Alexei picked up his sister as he repented for his deeds.

Grateful but curious, Alexei asked Hyōga why he saved his younger sister without hesitation. As he and Yakoff walked away, Hyōga revealed that Natassia shared the same name as his deceased mother.

Isaac was Hyōga's long lost friend from his younger days in Siberia. The two met when Hyōga first began his training in Siberia with Camus (or the Crystal Saint in the anime). Whereas Hyōga's primary motivation for sainthood was the ability to visit his deceased mother beneath the oceans, Isaac aspired to become a saint in order to rid the world of injustice and evil.

When Isaac found out Hyōga's true intentions five years later, he was infuriated—but nevertheless felt compassion for his friend. On his first attempt to dive into the seas, Hyōga was hit with unnaturally powerful whirlpools. As Hyōga lost control, Isaac was overwhelmed with an uneasy feeling, and immediately rushed into the seas to search for his friend. He soon discovered an unconscious Hyōga entangled on the ship's net. Isaac picked up his comrade and began to swim to the surface—until he, too, was caught by a similar whirlpool. Losing control, Isaac slammed into a sharp, jagged iceberg face first, losing his left eye as a result. With Hyōga still in his grasp, Isaac punched an opening through the ice with all of his cosmos. Using the last bit of energy, he tossed Hyōga back to the surface. A second whirlpool then pulled Isaac away, and the young man was seemingly lost forever. On the surface, Hyōga and his mentor presumed that Isaac did not survive.

Isaac made his return in the Poseidon arc, to Hyōga's shock. However, the Isaac that stood before him was no longer the righteous young man he knew from his training days—he was now Kraken Isaac, one of Poseidon's seven generals of the seas. A long and deep scar ran from his eyebrow to his chin on the left side of his face. Isaac displayed resentment towards Hyōga for the lost of his eye, and for the lost of the Cygnus Cloth. Hyōga sympathized, and offered Isaac his own left eye to compensate for the Kraken's misery. The sea general gladly accepted and damaged Hyōga's eye- although not to the extent of blinding it. From this point on, Hyōga's left eye would be bandaged for the remainder of the series.

Now that the reunion was out of the way, Isaac quickly challenged Hyōga to a final showdown. At first, the bronze saint refused to fight his old friend, but soon he realized that Isaac's cosmos had been corrupted by the very thing he had once sworn to rid the world of. After an intense back-and-forth battle with the Cygnus's "Diamond Dust" and the Kraken's "Aurora Borealis", Hyōga, with the spirit of Camus guiding him, finally unleashed the "Aurora Execution" attack on Isaac. The sea general was promptly defeated.

With his dying breath, Isaac commended Hyōga's power, and the two reverted back to being good friends once more.

The relationship between Hyōga and Saori Kido/Athena is platonic at best. In the manga, he was initially indifferent about Saori and the Graude Foundation, until she revealed herself to be the current reincarnation of the goddess Athena. Even then, he did not concern himself with matters of Sanctuary, until his master Camus directly challenged him in Siberia. From that point on, Hyōga decided to commit to his duty as one of Athena's 88 saints.

In Capcom's videogame Street Fighter 3 Third Strike, Kurumada and Hyōga received homage, in the ending sequence of the character Remy. In it, Remy swims to the depths of an icy sea to visit his deceased sister, who closely resembles Hyōga's mother Natassia.

As stated by Masami Kurumada in interviews, he was going to make Milo Cygnus Hyōga's master. He changed his mind when he realized there could be a relation between the Aquarius and Cygnus constellations, as both Saints had water-ice -based fighting styles. Kurumada indeed wrote and illustrated a few pages of his manga, in which Hyōga and Milo interacted as master and disciple, but he rewrote and redrew them after defining and establishing Aquarius Camus as Hyōga's master. The non-published pages of the manga with Milo as Hyōga's master can be found in the web and in some special publications regarding Saint Seiya.

As Kurumada Christian elements for Hyōga's background and that Hyōga is a christian and as one he puts his faith in biblical God rather than the Greek deities, he also chose biblical and Christian names as a motif for three characters that had a close relationship with the CygnusSaint; the boy Yakoff (Russian variation of the name Jacob), Hyōga's mother Natassia (Russian variation of the Latin name Natalia, which means "Christmas Day") and Poseidon's Marina General, Kraken Isaac.